//
//  MainTabBar.swift
//  SinaWeibo
//
//  Created by yang on 15/11/8.
//  Copyright © 2015年 yang. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {
    
    //重写构造方法
    override init(frame:CGRect){
        super.init(frame:frame)
        setUpdataUI()
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setUpdataUI()
    }
    //加载控件
    private func setUpdataUI(){
        addSubview(button)
    }
    //懒加载 Button
    lazy var button :UIButton = {
        let btn = UIButton()
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState:UIControlState.Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState:UIControlState.Selected)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState:UIControlState.Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState:UIControlState.Selected)
        btn.sizeToFit()
        return btn
        }()
    
    //设置 button 的 frame
    override func layoutSubviews() {
        super.layoutSubviews()
        let w = self.bounds.width / 5
        let h = self.bounds.height
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        
        var index: CGFloat = 0
        for subView in subviews {
            
            if subView.isKindOfClass(NSClassFromString("UITabBarButton")!){
                
                subView.frame = CGRectOffset( rect , index * w, 0)
                //                index += index == 1 ?2 :1
                
                index += index  == 1 ? 2 :1
            }
        }
        button.frame = CGRectOffset(rect, w * 2, 0)
    }
}